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* @license Apache-2.0
*
* Copyright (c) 2026 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isnan = require( '@stdlib/math/base/assert/is-nan' );
var incrvmr = require( '@stdlib/stats/incr/vmr' );
// MAIN //
/**
* Returns an accumulator function which incrementally computes a variance-to-mean ratio (VMR), ignoring `NaN` values.
*
* @param {number} [mean] - mean value
* @throws {TypeError} must provide a number primitive
* @returns {Function} accumulator function
*
* @example
* var accumulator = incrvmr();
*
* var D = accumulator();
* // returns null
*
* D = accumulator( 2.0 );
* // returns 0.0
*
* D = accumulator( 1.0 );
* // returns ~0.33
*
* D = accumulator();
* // returns ~0.33
*
* @example
* var accumulator = incrvmr( 3.14 );
*/
function incrnanvmr( mean ) {
var acc;
if ( arguments.length ) {
acc = incrvmr( mean );
} else {
acc = incrvmr();
}
return accumulator;
/**
* If provided a value, the accumulator function returns an updated accumulated value. If not provided a value, the accumulator function returns the current accumulated value.
*
* @private
* @param {number} [x] - new value
* @returns {(number|null)} accumulated value or null
*/
function accumulator( x ) {
if ( arguments.length === 0 || isnan( x ) ) {
return acc();
}
return acc( x );
}
}
// EXPORTS //
module.exports = incrnanvmr;
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